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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '22150f4168ebbfe9615d9ef808485a7184b4a10faf791aedae7ab7e66dcf8ec3' 
  AND token = 'LQFluaza9CYeXWpDoA159dXwYEfzA6dJJrQ6Z/RoMtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00778

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}